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AssigneeU.S. Philips Corporation
InventorJohan P. M. G. Linnartz
Estimating the term…
A method and system for recording and reproducing, such as on a record carrier, content information and supplemental information relating thereto. The content information may be audio and/or video, and the supplemental information may provide author identification and/or copy control status. An encoded signal is generated representing the content information and which includes a watermark pattern representing the supplemental information. The watermark pattern cannot be changed without impairing the quality of the content information during reproduction. The supplemental information also includes a control pattern, the watermark being generated by applying a one-way function to such control pattern. This has the advantage that any alteration of the watermark or the control pattern can be detected easily, because it is not computationally feasible to calculate a new control pattern for an altered watermark. Therefore, the supplemental information is well protected against unauthorized manipulation. An attempt to fully replace the watermark pattern will affect the quality of reproduction of the content information. In a copy control method allowing a first generation copy (“copy-once”), the original control pattern is processed several times by the one-way function for generating the watermark. Each player or recorder processes the control pattern once before outputting/recording it, thus forming a cryptographically protected down-counter.
A method of recording and reproducing content information and supplemental information relating thereto, in which:
A method of encoding content information and supplemental information relating thereto, comprising:
A method of retrieving supplemental information related to content information, comprising:
A system for transferring content information and related supplemental information from a system input to a system output via a transfer signal which includes an encoded signal, the system comprising:
An arrangement for generating an encoded signal for recording, which arrangement comprises:
An arrangement for read-out of a recorded encoded signal representing content information as well as a watermark pattern combined with a control pattern, said combination constituting supplemental information, which read-out arrangement comprises:
An encoded signal for use in a recording signal generating arrangement in which the encoded signal represents content information and a watermark pattern, the watermark pattern being the result of a control pattern processed by a one-way function, the watermark pattern and the control pattern in combination constituting supplemental information.
A control signal for use in a recording signal generating arrangement, in which:
A record carrier having recorded thereon an encoded signal in the form of a watermark pattern and a control pattern, and in which:
Dependencies are inferred from the claim text.